Button hole sewing machine



(No Model.)

. 2' Sheets- -S-heet 1 .v T.-P. HART.

BUTTON HOLE SEWING MACHINE. A

Patented May 31-, 1887.

, 71 172 1566: fizz/enter.-

I (No Model.) 2 sheets sh'eet 2.

T. P. HART.

, BUTTON HOLE SEWING MACHINE.

N0.363',8Z3. Patente dMay3Ll8'8'7.

- Q I [raven/207*.- ii ig i; a 9 JZMM -7- v I 6 UNITED STATES PATENT OFFI E.

THOMAS F. HART,.OF LYNN, MASSACHUSETTS, ASSIGNOR TO MIOHAEL L.

' HILLER, OF NEW YORK, N. Y.

BUTTON-HOLE SEWING-MACHINE. f

SPECIFICATION forming part of Letters Patent N 0. 363,823, dated May 31, 1887.

I Application filed June 16, 1886. Serial No. 205,334. (No model.)

To aZZ whom it may concern.-

Be it known that I, THOMAS F. Hanna citizen ofthe United St ates, residing at Lynn,in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Button-Hole Sewing-lVIachines for Sewing Round Holes; and I do hereby declare that the same are fully described in the following specification and illustrated in the accompanying drawings.

This invention relates to improvements in button-hole sewing-machines for the purpose ofstitching around the edges of round holes; and it is carried out as follows, reference being bad to the accompanying drawings, where- Figure 1 represents a frontelevation of an ordinary button-hole sewing-inachine provided with my improvement. Fig. Zrepresents a plan view of the clamp. Fig. 3 represents a sectional side elevation of the clamp with the button-plate, bed, and clamp-operating gear shown in section. Fig. 4 represents aperspective detail view of the driving and clamp-operating gears. Fig. 5 represents a, plan view of the button and button-plate. Fig. 6 represents a detail perspective view of the'clamp guide-block, and Fig. 7 represents a plan view of a piece of work done on the machine.

Similar letters refer to similar parts-wherever they occur 011 the different parts of the drawings.

a is the bed, 6 the goose-neck, and cthe vertically and laterally movable needle-bar, as usual on button-hole sewing-machines.

c is the needle secured to the lower end of the needle-bar c, as shown inFig.

In a recess, a, in the top of the bed a is located the usual driving-gear, cl, attached to shaft (1, that is set in a rotary motion from the drivingshaft of the sewingunachinein the usual manner. The gear d meshes intothe teeth of the clampoperating gear 0, that is made to turnaround the annular-ring a",forn1- ing a part of the beda, as shown in Figs. 3 and 4.

a is a central perforation in the interior of theannular ring a for the needle to pass up and down through in forming the stitches. On the upper side of the clamp-operating gear 6 are a number of radial ribs or Walls, 0' e, and intermediate recesses or grooves, e c, as shown I in Figs. 3 and 4, for a purpose as will hereinafter be morefully described.

f is the button-plate secured to the top of the stationary annular ring a by means of suitable screws f f f, as shown in Figs. 3 and 5, and to the central portion of such buttonplate is secured the button f f is avertical slotted perforation through the button f for the vertically and laterally .lIlOVZLblG needle 0 to pass when forming the stitches. Above the button-plate f is located the clamp-plate 9, having a central grooved perforation, g, into'which the button f projects, such perforation being, however, larger in diameter than the button f, according to the size of the hole H in the material, H, (shown in Fig. 7,) to bebutton-hole stitched.

Secured to and risingfrom the clamp-plate g is the hollow clamppost h, in which is vertically adjustable the stud h, having knob or handle h on its upper end and normally held in the operative position shown in Fig. 3 by the influence of the coiled spring h". The lower end of the stud h is made toproject in any desired one of the grooves or recesses c on the upper portion of the clamp operating gear e, as shown in Fig. 3. To the front of the post h is secured, or made in one piece with it, the

earh to which is pivoted at h the T i, to the front of which are secured the clamp-arms I I. (Shown'in Figs. 2 and 3.)

70 represents the annular clamp-jaw, having upwardly-projecting pins 70 is projecting through perforations in the free ends of the clamp-arms I I and pivoted to the latter in a suitable manner, as shown in Figs. 2 and 3.

Z l are pressure-springs located between the upper side of clamp-plate g and-under side of the clamp-arms I I, as shown in Fig. 3, for the 0 purpose of automatically raising the clamparms 11 to the position shown in Fig. 3 as soon as the pressure deviceis relieved.

The material to be stitched is confined and held firmly between the under side of the an} 5 nular clamping-jaw 7c and central upper portion of the clamp-plate g-by means of the pressure device shown in Figs. 2 and 3, such pressure device consisting of the vertical rod m,

rising from and secured to the clamp-plate 9, Ice

and provided with a horizontal pin orprojec-- tion, at, at or near its upper end. Surroundof clamp-jaw k the latter is forced downward upon the upper side of the material, so as to hold it firmly in place on the clamp-plate by turning the sleeve n a part of a revolution around the rod m, causing it to move downward by the cam-surface n acting on the stationary projection m on rod 12, by which operation the ears a n are caused to force the free ends of the clamp-arms I I downward, and with them the clamp-jaw k. After the edge of the circular holein the material H has been button-hole stitched said material is released from its confinement between the clampe' e on the said gear a; and the object of such rectwses or grooves e c is to enable the stud h to be placed in front of the operator and locked to the gear a when commencing the work on a new piece of material, and thus to facilitate the proper placing of the material on the clamp-plate before the machine is set in operation. In button-hole stitching a circular hole it has been found necessary to rotate the clamp-plate a little more than one complete revolution, and ifit were not for the grooves or recesses e e on the clamp -'operating gear e, combined with the vertically adjustable stud h, the position of the clamp would vary afterthe completion of each piece stitched, and this objection is entirely overcome by the aforesaid clamp-adjusting device.

For the purpose of properly guiding the clamp-plate g during its eccentric rotation around the button f, I secure, in an adjustable manner, to the under side of the buttonplatef the clamp-guide block 0, (shownin Fig. 3, as well asin detail in Fig. 6,) such guideblock having an npwardly'projecting lip, 0, that is held against the interior edge ofthe pcrforation g in clamp-plate g, and said guideblock is capable of a lateral adjustment by means of the set-screw 0", passing through a slot-hole, 0", in the guide-block 0 and screwed into a screw-threaded perforation in the button-platef, as shown in Fig. 3.

The perforation g in clamp-plate g, in proportion to the diameter of button f is made according to the diameter of the hole H to be button-hole stitched in the material, H.

f is a slot-hole in the button-plate f, through which the lip 0 projects, to enable the guideblock 0 to be adjusted laterally for the purpose set forth.

The operation of forming the stitches'is the same as in ordinary button-hole sewing-machines, and need not here be described.

IVhat I wish to secure by Letters Patent and claim is '1. In a button-hole sewing-machine for the purpose set forth, the rotary clamp-operating gear 6 and its notches or recesses e 0, combined with the clamp plate 9 and yielding clamp-jaw 70, connected to the clamp-arms I I, means, substantially as described, for forcing the arms I I downward, and the vertically-adju'stable spring-pressed pin it,- for locking the clamp-plate g and notched gcar'c together in any desired position, as set forth.

2.v In a button-hole sewing-machine for the purpose set forth, the stationary button-plate fand its perforated button f in combination with the horizontally-adjustable'clamp guideblock 0 and its upwardly-projecting lip 0, adapted to bear against the interior edge of the perforation g in clampplate g, the clamp-jaw 7c and its arms II, the clamping device, as de scribed, and means, substantially as described,

for locking the gear 0 and clamp-plate g t)- gethcr, as set forth.

3. In a button-hole sewingmachine for the purpose set forth, the stationary plate f and its perforated button f, the rotary gcare, having'notches or recesses, as described, the plate 9, having the spring-pressed pin h, for connecting it to gear 0, the clamp-plate 70, mounted on or connected to clamparms I I and having springs Z Z, and clamping device, all arranged and combined substantially as and for the purpose set forth.

In testimony whereof I have afiixed mysignature in presence of two witnesses.

, THOMAS F. HART.

\Vitnesses:

ALBAN ANDREN, HENRY CHADBOURN. 

